This is for your relatives and friends that want to avoid using the Terminal.

Download this free app from Github. As referenced in this Macworld article, the single-function app will quickly check your machine for the infection. The app doesn't remove the malware, which will be left up to the user by manually following the instructions from F-secure.

Java for Mac OS X 10.6 Update 8

Apple released an official software update that will remove the flashback malware from your computer. Just run software update on your Mac to install it. Here are the details from the Apple support article:

This Java security update removes the most common variants of the Flashback malware.

Java for OS X Lion 2012-003

This Java security update removes the most common variants of the Flashback malware.

This update also configures the Java web plug-in to disable the automatic execution of Java applets. Users may re-enable automatic execution of Java applets using the Java Preferences application. If the Java web plug-in detects that no applets have been run for an extended period of time it will again disable Java applets.

Here is an Apple support article about the security content of the Java updates.